It depends on the day. On the weekends its 3-4 PM. If arrive before that you still can drop off you luggage at the concierge and go on to Disney springs, it's a 15 minute walk and you also can catch a bus to the parks and other resorts.
Check in 4pm, check out 11am
Ours was 3pm, but we arrived early around 2pm and our room was ready early by chance.
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